POWER August 2015 - 38

REINVENTION AWARD
2. Before and after flame safety controls. The original Norpak Flame Safety panel
(top) is a stark contrast with the new Rockwell flame safety controls (bottom). Courtesy: Colorado
Energy Nations, GDF SUEZ Energy NA, and Behrent Engineering
3. Before and after operator controls.
On the top is a portion of the old Fisher
AC3 operator panel. Below is a shot of the
new Rockwell system. Courtesy: Colorado
Energy Nations, GDF SUEZ Energy NA, and
Behrent Engineering
incentives for a generating plant to adopt environmental
controls before federal regulations
required them, as discussed in POWER's online
article " The Voters Were Right: Colorado
and Minnesota's Paths to Clean Energy. "
Obsolete Control Systems. When Unit
ash under the U.S. Environmental Protection
Agency's Coal Combustion Residuals rule.
CEN worked with the Colorado Air Pollution
Division to develop a flexible strategy
for meeting the BART-derived NOx
emission
limits using either individual boiler limits
or a limit based on emission averaging for
multiple units. Both the facility's blended
fuels plan and the RH-SIP were finalized in
December 2012. (The remaining regulations
were still pending.)
CEN reviewed its RH options to ensure
100% compliance by either installing natu38
ral
gas burning capability into Boiler 5 and/
or installing additional coal NOx
controls on
that boiler. The team decided to install natural
gas firing capability first, as this would
provide immediate business benefits resulting
from added fuel options, would ensure
CEN's ability to meet RH NOx
limits if emission
averaging " fell short, " and would retain
the option to install additional coal controls
later, if future fuel costs favored coal, according
to Stevens.
Incidentally, this approach is another example
of how state regulations provided
www.powermag.com
5 was built, the owner did not consider programmable
logic control (PLC) or distributed
control systems to have sufficient reliability
to be trusted with control of the boiler, so
the burner management system, which plant
management calls the Flame Safety System,
was designed using Square-D Norpak logic.
Norpak was a discrete solid-state logic system
that had been used throughout the brewery
for critical control systems. However, as
you can see from Figure 2, a Norpak panel
could be intimidating for maintenance work.
Spare parts were no longer available, and
the pool of technicians with Norpak troubleshooting
skills was shrinking. Plant management
was happy to replace the old panel.
The combustion control system had been
designed using the Fisher AC3 electronic analog
control system (Figure 3). Fisher AC3
POWER | August 2015

http://www.powermag.com

POWER August 2015

Table of Contents for the Digital Edition of POWER August 2015

Contents
POWER August 2015 - Cover1
POWER August 2015 - Cover2
POWER August 2015 - Contents
POWER August 2015 - 2
POWER August 2015 - 3
POWER August 2015 - 4
POWER August 2015 - 5
POWER August 2015 - 6
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POWER August 2015 - Cover3
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